Implications of the Crystal Barrel data for meson-baryon symmetries

Making use of numerous resonances discovered by the Crystal Barrel Collaboration we discuss some possible relations between the baryon and meson spectra of resonances composed of the light non-strange quarks. Our goal is to indicate new features that should be reproduced by the realistic dynamical models describing the hadron spectrum in the sector of light quarks.Comment: Completely modified version; to appear in Mod. Phys. Lett.

Form Factors of Composite Systems by Generalized Wigner-Eckart Theorem for Poincar\'e group

The relativistic approach to electroweak properties of two-particle composite systems developed previously is generalized here to the case of nonzero spin. This approach is based on the instant form of relativistic Hamiltonian dynamics. A special mathematical technique is used for the parametrization of matrix elements of electroweak current operators in terms of form factors. The parametrization is a realization of the generalized Wigner--Eckart theorem on the Poincar\'e group, form factors are corresponding reduced matrix elements and they have the sense of distributions (generalized functions). The electroweak current matrix element satisfies the relativistic covariance conditions and in the case of electromagnetic current it also automatically satisfies the conservation law.Comment: Submitted to Theor. Math. Phy

THE FIRST EXPERIENCE WITH TISSUCOL AT MOSCOW CITY CANCER HOSPITAL SIXTY-TWO

The paper describes the first experience with the fibrin sealant Tissucol at Moscow City Cancer Hospital Sixty-Two. The authors used this agent in different clinical situations. However, Tissucol showed the highest efficacy in arresting long-term severe lymphorrhea. The described clinical case clearly demonstrates the abilities of this agent and allows it to be recommended for use in other areas of oncology

A cosmological constant from the QCD trace anomaly?

According to recent astrophysical observations the large scale mean pressure of our present universe is negative suggesting a positive cosmological constant like term. This article addresses the question of whether non-perturbative effects of self-interacting quantum fields in curved space-times may yield a significant contribution. Focusing on the trace anomaly of quantum chromo-dynamics (QCD), a preliminary estimate of the expected order of magnitude yields a remarkable coincidence with the empirical data, indicating the potential relevance of this effect. PACS: 04.62.+v, 12.38.Aw, 12.38.Lg, 98.80.Es.Comment: 4 pages, RevTe

Восстановление оттока желчи при повреждении гепатикохоледоха и несостоятельности билиобилиарного анастомоза после лапароскопической холецистэктомии

The aspect of injuring bile ducts during laparoscopic cholecystectomy is still of current concern. Causes of this complication include insufficient experience of surgical team, poor knowledge of topographic anatomy of subhepatic space, particularly when perivesical inflammatory infiltrate presents, inadequate approach conversion and so on. Most of patients with bile duct injuries undergo repeated operation in the same surgical unit where cholecystectomy was performed. In many cases, this results in a shortening of the segment of the common hepatic duct, which is favorable for restoration. Subsequent reconstructive surgery is usually performed in the worse conditions with a high risk of complications such as failure of sutures, biliary fistula, anastomotic stricture, etc. Most specialists recommend to abstain from primary reconstruction of the biliary tree in hospitals with no proper experience in hepatobiliary surgery and to perform only the external drainage of subhepatic space with subsequent admission of patient to a specialized clinic. We report a case of a young woman who suffered an excision of hepaticocholedochus fragment during laparoscopic cholecystectomy. A primary reconstructive surgery (hepatico-hepaticoanastomosis) was performed in the same clinic and resulted in external fistula of the common hepatic duct. The subsequent operation (hepaticoejunostomy) was performed in a specialized department of the regional clinical hospital. The woman underwent right-sided hypochondrium laparotomy with debridement of postoperative scar tissues. The stumps of common bile duct were mobilized in compact inflammatory infiltrate. The operation ended with distal stump closure and hepaticoenteroanastomosis formation. The patient was discharged with recovery. Six months later, her condition was satisfactory, and she was engaged in occupational activity.Проблема повреждений желчных протоков во время лапароскопической холецистэктомии не теряет свою актуальность. Причины осложнений: недостаточный опыт хирургической бригады, ограниченные знания топографической анатомии подпеченочного пространства, особенно в условиях перивезикального воспалительного инфильтрата, несвоевременная конверсия доступа и прочее.Большую часть больных с травмой желчных протоков повторно оперируют в хирургических отделениях, где выполняют холецистэктомию. Нередко это заканчивается несостоятельностью билиобилиарного анастомоза и приводит к укорочению перспективного для восстановления сегмента общего печеночного протока.Последующую реконструктивную операцию выполняют в худших условиях с высокой вероят­ностью различного рода осложнений (несостоятельность швов, желчный свищ, стриктура анастомоза и прочее). Большинство авторов рекомендуют воздержаться от первичных реконструкций билиарного дерева в стационарах без должного опыта гепатобилиарной хирургии и ограничиться санацией и наружным дренированием подпеченочного пространства с последующим направлением пациента в специализированные клиники. Представлено клиническое наблюдение лечения молодой женщины, которой во время лапароскопической холецистэктомии иссечен фрагмент гепатикохоледоха.В этой же клинике выполнена первичная реконструктивная операция (гепатикогепатикоанастомоз), после которой сформировался наружный свищ общего печеночного протока. Очередная операция проведена в специализированном отделении областной клинической больницы. Выполнена комбинированная правосторонняя подреберная лапаротомия с иссечением после­операционного рубца. В плотном воспалительном инфильтрате с напластованием фибрина мобилизованы культи общего печеночного протока. Дистальная культя ушита. Сформирован гепатикоэнтероанастомоз. Пациентка выписана с выздоровлением. При осмотре через 6 месяцев состояние удовлетворительное, работает по специальности

Lagrangian for the Majorana-Ahluwalia Construct

The equations describing self/anti-self charge conjugate states, recently proposed by Ahluwalia, are re-written to covariant form. The corresponding Lagrangian for the neutral particle theory is proposed. From a group-theoretical viewpoint the construct is an example of the Nigam-Foldy-Bargmann-Wightman-Wigner-type quantum field theory based on the doubled representations of the extended Lorentz group. Relations with the Sachs-Schwebel and Ziino-Barut concepts of relativistic quantum theory are discussed.Comment: 10pp., REVTeX 3.0 fil

Interactions of a j=1j=1 boson in the 2(2j+1)2(2j+1) component theory

The amplitudes for boson-boson and fermion-boson interactions are calculated in the second order of perturbation theory in the Lobachevsky space. An essential ingredient of the used model is the Weinberg's $2(2j+1)$ component formalism for describing a particle of spin $j$, recently developed substantially. The boson-boson amplitude is then compared with the two-fermion amplitude obtained long ago by Skachkov on the ground of the hamiltonian formulation of quantum field theory on the mass hyperboloid, $p_0^2 -{\bf p}^2=M^2$, proposed by Kadyshevsky. The parametrization of the amplitudes by means of the momentum transfer in the Lobachevsky space leads to same spin structures in the expressions of $T$ matrices for the fermion and the boson cases. However, certain differences are found. Possible physical applications are discussed.Comment: REVTeX 3.0 file. 12pp. Substantially revised version of IFUNAM preprints FT-93-24, FT-93-3

Neutral Particles in Light of the Majorana-Ahluwalia Ideas

The first part of this article (Sections I and II) presents oneself an overview of theory and phenomenology of truly neutral particles based on the papers of Majorana, Racah, Furry, McLennan and Case. The recent development of the construct, undertaken by Ahluwalia [{\it Mod. Phys. Lett. A}{\bf 9} (1994) 439; {\it Acta Phys. Polon. B}{\bf 25} (1994) 1267; Preprints LANL LA-UR-94-1252, LA-UR-94-3118], could be relevant for explanation of the present experimental situation in neutrino physics and astrophysics. In Section III the new fundamental wave equations for self/anti-self conjugate type-II spinors, proposed by Ahluwalia, are re-casted to covariant form. The connection with the Foldy-Nigam-Bargmann-Wightman- Wigner (FNBWW) type quantum field theory is found. The possible applications to the problem of neutrino oscillations are discussed.Comment: REVTEX file. 21pp. No figure

Fermion-fermion and boson-boson amplitudes: surprising similarities

Amplitudes for fermion-fermion, boson-boson and fermion-boson interactions are calculated in the second order of perturbation theory in the Lobachevsky space. An essential ingredient of the model is the Weinberg's 2(2j+1)-component formalism for describing a particle of spin j. The boson-boson amplitude is then compared with the two-fermion amplitude obtained long ago by Skachkov on the basis of the Hamiltonian formulation of quantum field theory on the mass hyperboloid, p_0^2 - p^2=M^2, proposed by Kadyshevsky. The parametrization of the amplitudes by means of the momentum transfer in the Lobachevsky space leads to same spin structures in the expressions of T-matrices for the fermion case and the boson case. However, certain differences are found. Possible physical applications are discussed.Comment: 7 pages, no figures, talks given at the 5th International Symposium on "Quantum Theory and Symmetries", July 22-28, 2007, Valladolid, Spain and the 10th Workshop "What comes beyond the Standard Model?", July 17-27, 2007, Bled, Sloveni